NOTE: Note even sure if this still works GoogleMapAPI used to use the Yahoo geocode lookup API. This is the application ID for YOUR application. This is set upon instantiating the GoogleMapAPI object. (http://developer.yahoo.net/faq/index.html#appid)

available: YAHOO Yahoo! API. US geocode lookups only. GOOGLE Google Maps. This can do international lookups, but not an official API service so no guarantees. Note: GOOGLE is the default lookup service, please read the Yahoo! terms of service before using their API.